5 county-level rules, plus city-specific rules for 1 city in Hamilton County, Ohio.
Verified from official government sources
Hamilton County has no countywide ADU code. Accessory dwelling units are governed by your municipality's zoning or, in unincorporated townships, by the township's zoning resolution adopted under Ohio Revised Code Chapter 519. Check your local zoning office first.
ORC 519.02(A)
Except as otherwise provided in this section, in the interest of the public health and safety, the board of township trustees may regulate by resolution, in accordance with a comprehensive plan, the location, height, bulk, number of stories, and size of buildings and other structures... and the uses of land for trade, industry, residence, recreation, or other purposes in the unincorporated terr...
Hamilton County has no single shed ordinance. Size thresholds, setbacks, and whether a zoning permit is needed for a shed are set by your city, village, or township zoning resolution under Ohio Revised Code Chapter 519.
ORC 519.02(A)
...the board of township trustees may regulate by resolution, in accordance with a comprehensive plan, the location, height, bulk, number of stories, and size of buildings and other structures, including tents, cabins, and trailer coaches, percentages of lot areas that may be occupied, set back building lines, sizes of yards, courts, and other open spaces...
Hamilton County has no countywide rule on converting a garage to living space. Conversions are governed by your municipality's or township's zoning resolution under ORC Chapter 519, plus Ohio Residential Code building permits.
ORC 519.02(A)
...the board of township trustees may regulate by resolution... the location, height, bulk, number of stories, and size of buildings and other structures... the uses of buildings and other structures... and the uses of land for trade, industry, residence, recreation, or other purposes in the unincorporated territory of the township.
Hamilton County has no countywide carport ordinance. Whether a carport is allowed, its setbacks, and any permit are governed by your municipality's zoning or your township's resolution under ORC Chapter 519.
ORC 519.02(A)
...the board of township trustees may regulate by resolution, in accordance with a comprehensive plan, the location, height, bulk, number of stories, and size of buildings and other structures... set back building lines, sizes of yards, courts, and other open spaces...
Hamilton County has no countywide tiny-home ordinance. Whether a tiny house on a foundation or on wheels is allowed depends on your municipality's or township's zoning resolution under ORC Chapter 519 and the Ohio Residential Code.
ORC 519.02(A)
...the board of township trustees may regulate by resolution... the location, height, bulk, number of stories, and size of buildings and other structures, including tents, cabins, and trailer coaches, percentages of lot areas that may be occupied... and the uses of land for trade, industry, residence, recreation, or other purposes...
1 cities in Hamilton County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
See every category we cover for Hamilton County — parking, noise, fences, fires, animals, pools, and more.
Hamilton County Ordinance Hub →